Dell's OptiPlex 3000 series of desktop PCs is aimed ... The OptiPlex 3090 we received is the base configuration, with 16GB RAM and a six-core Intel Core i5-10505 (from the "Comet Lake" CPU family ...

I've got a Dell Optiplex 390 with an i5-2400 in it ... has no documented memory capacity that I could see on the datasheet. Biostar lists my TH61 ITX as supporting up to 16GB.

Dell's OptiPlex 3000 series of desktop PCs is aimed ... The OptiPlex 3090 we received is the base configuration, with 16GB RAM and a six-core Intel Core i5-10505 (from the "Comet Lake" CPU family ...